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催化学报  2015 

Improvingtheefficiencyofadirectethanolfuelcellbyaperiodicloadchange

DOI: 10.1016/S1872-2067(14)60226-6, PP. 496-501

Keywords: Ethanolelectrooxidation,Electrocatalysis,Directethanolfuelcell,Polymerelectrolytemembranefuelcell,Platinum,Platinum-ruthenium

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Abstract:

?Wepresentasimplemethodtoincreasetheefficiencyofadirectethanolfuelcellbyaperiodicmodulationoftheload(pulsedmode).Thefuelcellwasperiodicallyshortcircuitedwitharesistor(1Ω)forafewseconds(highloadperiod)followedbyalowloadperiodofupto100swhentheresistorwasdisconnected.Theopencircuitvoltage(OCV)valuesbeforeandaftertheshortcircuitofthecellshowedanincreaseofupto70mV.ThehigherOCVwasduetotheoxidationandremovalofstronglyadsorbedCOduringtheelectricshortcircuitwhentheelectricpotentialoftheanodewasincreasedtobeclosetothecathodepotential.Thedepoisonedanodesurfacewasmuchmoreactivedirectlyaftertheshortcircuit.TheslowdecreaseoftheOCVobservedaftertheshortcircuitwascausedbythesubsequentpoisoningoftheanodesurface,whichcanbeneutralizedbyanothershortcircuit.Ingeneral,astableincreaseincellperformancewasobtainedbyrepetitionoftheelectricshortcircuit.Thedatashowedthatthepulsemodegaveanincreaseinthepowergeneratedbythedirectethanolfuelcellbyupto51%andwas6%onaverage.ItisanticipatedthatthismodeofoperationcanbeusedalsoindifferenttypesofpolymerelectrolytemembranefuelcellswhereCOpoisoningisaproblem,andafteroptimizationoftheparameters,amuchhighergaininefficiencycanbeobtained.

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